The answer is a geo-match custom rule in Cloud Armor. This is correct because Cloud Armor’s geo-match rule allows you to define allow or deny actions based on the geographic region of the client IP address, using a two-letter country code. When attached to an external HTTP(S) load balancer, these rules are evaluated at the Google edge before traffic reaches your backend, providing a first line of defense against DDoS attacks by blocking unwanted regions early. On the Google Professional Cloud Network Engineer exam, this concept tests your understanding of Cloud Armor’s security policy rules and their integration with load balancers; a common trap is confusing geo-match with advanced rate limiting or WAF rules, which serve different purposes. Remember that geo-match is purely location-based, not content-based. A helpful memory tip: think of “geo-match” as a bouncer checking IDs at the door—only the country on the ID matters, not what the person is carrying.
PCNE Configuring network services Practice Question
This PCNE practice question tests your understanding of configuring network services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A gaming company uses Cloud Armor with an external HTTP(S) load balancer to protect against DDoS attacks. They need to restrict access to the load balancer based on geographic region. What should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Geo-match custom rule in Cloud Armor
Cloud Armor supports geo-match custom rules that allow you to allow or deny traffic based on the geographic region of the client IP address. When attached to an external HTTP(S) load balancer, these rules are evaluated at the edge before traffic reaches the backend, providing effective geo-based access control against DDoS attacks.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Geo-based routing policy on the backend service
Why it's wrong here
Routing policies direct traffic to different backends but do not enforce access control.
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A firewall rule that blocks IPs from certain countries
Why it's wrong here
Firewall rules apply to backend instances, not to the load balancer directly, and require maintaining IP lists.
✓
Geo-match custom rule in Cloud Armor
Why this is correct
Cloud Armor rules can filter traffic based on geographic region (e.g., country or continent).
Related concept
Read the scenario before looking for a memorised answer.
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Use Cloud CDN with geo filtering
Why it's wrong here
Cloud CDN's geo filtering is for content access, not for security policy at the load balancer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between Cloud Armor's security policies (which include geo-match rules) and backend service routing policies, leading candidates to confuse geo-based routing with geo-based access control.
Detailed technical explanation
How to think about this question
Cloud Armor geo-match rules use MaxMind GeoIP2 databases to map client IP addresses to countries, regions, or continents. The rules are evaluated in order of priority, and a deny rule with a geo-match condition can be placed at a high priority to block traffic from specified regions before any other processing occurs. This is particularly useful for complying with regional licensing restrictions or mitigating attacks originating from specific geographic areas.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Configuring network services — This question tests Configuring network services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Geo-match custom rule in Cloud Armor — Cloud Armor supports geo-match custom rules that allow you to allow or deny traffic based on the geographic region of the client IP address. When attached to an external HTTP(S) load balancer, these rules are evaluated at the edge before traffic reaches the backend, providing effective geo-based access control against DDoS attacks.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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